Vibrational Activation Triggers Ultrafast Excited State Intramolecular Proton Transfer in Single-Benzene Fluorophores
Abstract
Single-benzene fluorophores (SBFs) are exceptionally light-weight quantum emitters which have recently been shown to display Excited State Intramolecular Proton Transfer (ESIPT) and highly tunable dual-fluorescence that could be exploited for multiple applications. Here, we employ excited-state molecular dynamics to investigate the ultrafast dynamics of ESIPT in two different SBFs, one of which with a new structure proposed in this work. We find that both single and double ultrafast proton transfers can be triggered by exciting specific molecular vibrations. Strikingly, the kinetic activation of these vibrations - selected by atomistic, symmetry-based analysis - can considerably enhance the yield of proton transfer(s), as well as direct the reaction towards either single or double-transfer products. In-depth analysis elucidates the origins of this vibronic control, providing atomistic guidelines through which both the rate and fate of ESIPT could be steered using ultrafast IR-Vis spectroscopies.
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BibTeX
@misc{de2026vibrational,
title = {{Vibrational Activation Triggers Ultrafast Excited State Intramolecular Proton Transfer in Single-Benzene Fluorophores}},
author = {Brieuc Le Dé and Simon Huppert and Riccardo Spezia and Alex Chin},
howpublished = {HAL},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.20261},
eprint = {2608.20261},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05844289v1},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Vibrational Activation Triggers Ultrafast Excited State Intramolecular Proton Transfer in Single-Benzene Fluorophores
AU - Brieuc Le Dé
AU - Simon Huppert
AU - Riccardo Spezia
AU - Alex Chin
PY - 2026
DA - 2026/08/20
PB - HAL
DO - 10.48550/arxiv.2608.20261
UR - https://hal.science/hal-05844289v1
AB - Single-benzene fluorophores (SBFs) are exceptionally light-weight quantum emitters which have recently been shown to display Excited State Intramolecular Proton Transfer (ESIPT) and highly tunable dual-fluorescence that could be exploited for multiple applications. Here, we employ excited-state molecular dynamics to investigate the ultrafast dynamics of ESIPT in two different SBFs, one of which with a new structure proposed in this work. We find that both single and double ultrafast proton transfers can be triggered by exciting specific molecular vibrations. Strikingly, the kinetic activation of these vibrations - selected by atomistic, symmetry-based analysis - can considerably enhance the yield of proton transfer(s), as well as direct the reaction towards either single or double-transfer products. In-depth analysis elucidates the origins of this vibronic control, providing atomistic guidelines through which both the rate and fate of ESIPT could be steered using ultrafast IR-Vis spectroscopies.
ER -